pchp your plan is almost the same as mine. I'm guessing you have Fahrenheit temp, we have celcius so I'm having about 45 colours and i'm going to do the highs and lows separate and sew the finished ones back to back.
red stilettoes yws we have a hood climate here on the west coast of Australia. Never any freezing days and only about 15 days in summer that go over 45C. Air conditioners are good